Pole.



No. 884,171. PATBNTED APB.. 7, 1908.

D. W. KRELLWITZ.

' POLE. APPLICATION FILED NOV. 19, 1906-.

lllll'llllllll. Il llrlllllll A rights and steel horizontals.

DIEDRICH WILLIAM KRELLWITZ, OF ST. CATHARINES, ONTARIO, CANADA.

POLE.

Specification of Letters Patent.

vPatented April '7, 1908.

Application filed November 19, 1906. Serial No. 343,985.

fo all whew/t may cenicero:

Be it known that l, linniuon v\t7t"ii.LiAi\i KRELLWiTZ, of 'the city of St. Catharinegin .the count oi Lincoln in the Province ol On The pole consists essentially of -a steel. skeletonpolel frame united with concrete 'forming a steel concret-e pole. The said steel skeleton polefraine cnsists'of steel up- A The uprights being arranged and constructed in detail as hereinafter more particularly explained.

Figure 1. is aside View of a pole constructed in accordance Wit-li iny invention. Fig. 2. is a View showing tbestecl skeleton frame of ther pole. Big. 3. isa longitudinal section ofthe pole at right an rles to-Fig. l. Fig. 4. is a cross` sectional p an"tl1rough the top of the pole. Fig. 5. is a cross sectional plan through `the-middle oi the ole.

Fig. 6. isla cross scctional plan throng i the bottoni of the pole.

Any pole which .is subject to horizontal pulls and great pulls duc to erecting said pole ias considerable transverse stress which tends to bend and break the pole by rupturing the sido of the pole. which is in compres-v sion and by -40 pulling apart the opposite sidi` which isin tension.

My' invention is designed to withstand the compressive .and tensih` stresses and ai'oid the breaking olthc pole during tuoeti'on.

In a sin-table inold thoroncrete bod marked B'is cast-with the steel skeleton 'l'ranic embedded therein.

The uprights used l'o'r the entire length nre ot' a uinlorni cross sectional area.'

The lowestI portion "1" being inudc ol' u 'high larbon steel and the. portion fll above Said lowoi' liortion to be olI a'lcss carbon steel andv the next portion P2 above thelattcr ol' a still lower carbon steel and so bear on the pole and gradually diminish in strength from the bottom lupwardly. In other words, the steel rods or sections ofthe iiprights are of greater strength at the bottoni ot' the pole than at the top. The horizontal pieces A for holding the steel rods in space-l relation are wires coiled around the rods as at. if., only a few ole such-rods being shown in full View for clear-ness ol' illustration, the remaining rods being shown ditigrainniatically.

- ln order to designs-le the. different carbone steel and that they nnty not Je put in their wrong positions they are .made ol` ditlerent .shapes having the saine cross sectional area.

ani aware of diil'erent patented. shaped bars but it is not the object` of niy invention to patent a particular shaped bar.

The horizontal pieces marked A of the said steel skeleton traine are acting as ties so as to -aroirl the rei-tical members from bulging out sidewise,'aiid also to strengthen the concrete from cracking caused by the erection of the polev and the expansion and contraction of a large variation in the teinpeiaturc or in other words to resist thermal stresses.

ln molding I provide ladder rungs which are set in the soft concrete when the pole is being molded which gives a greater degree ol" safety to a man climbing the-pole.

l ain aware that the Canadian patent. nuniber ninety-two thousand six hundred and eighty-eight was granted on April 18th, 1905, for a pole having longitudinal reinforcing rods ot' varying' cross sectional arca but thc object otl iny inveiition is to haven uniformcross sectional ai u as specilied.

l ani also ownic oll polos built bclorc invention '.\`o. 92688, in France und Italy,

.hiivintl' thc combination ol steel with the inain body ol'eoncrcte'. And l there lori` know that thc coinbnnition ol' stool located in proximity-ol exterior ol' thc polo with thelinnn body ol' concrete is not new. Butl. ani not aware ot poles having thc eoinbiipition with theinem body ot eomfretc,v ot i'c-niforcing uprights cach 'ola unit'ornl cross sectional area; said uprights being inude. ol` ditlercnt carbon steel decreasing froin'bottoni portion to the top portion.

What l claim as iny inyention is l. ln poles the combination with the inain body of concrete, of re-inforcing uprights of. the saine cross sectional area throughout-'thc structure entire length of of different grades of carbon steel and each successive portion from l the pole decreasing from a the bottom of high carbon steel specified.

2. In a pole, the combination of a steel structure composed of sections arranged end to end and extending longitudinally of thev pole, each section Including longitudinal members of carbon steel of a di'llerent grade from those of an adjacent section, with a body of concrete in which the structure is I embedded.

3. In a to the top of the pole as pole, the combination of a metal composed of spaced upiights of uniform cross section at all points and having portions of greater strength 'at the bottom I and decreasing in strength upwardly, horizontal'members extending around the spaced uprights engaging therewith, with e body of concrete in which the structure is embedded. et. As an article of manufacture, a steel structure for' a pole, said structure comprising a number of sections each consisting of a plurality of steel connecting the rods together in fixed relation, the rods of adjacent sections beingof dierent radesl of steel' and having their ends rigid y secured to form continuous members extending longitudinally of the ole.'

l In testimony whereof I have Iereunto set my hand and seal, this twenty-seventh of October A. D. 1906.

DIEDRICII WILLIAM KRELLWIIZ. It. 8.] Witnesses:

FRANK B. MISENER, WILLIAM COLE.

rods, and means for 

